Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of the first image in a sequence for a displayscreen or portion thereof with transitional graphical user interface,showing our new design;

FIG. 2 is a front view of the second image thereof;

FIG. 3 is a front view of the third image thereof;

FIG. 4 is a front view of the fourth image thereof;

FIG. 5 is a front view of the fifth image thereof;

FIG. 6 is a front view of the sixth image thereof;

FIG. 7 is a front view of the seventh image thereof;

FIG. 8 is a front view of the eighth image thereof;

FIG. 9 is a front view of the ninth image thereof;

FIG. 10 is a front view of the tenth image thereof;

FIG. 11 is a front view of the eleventh image thereof;

FIG. 12 is a front view of the twelfth image thereof; and,

FIG. 13 is a front view of the thirteenth image thereof.

The appearance of the transitional graphical user interface sequentiallytransitions between the images shown in FIGS. 1-13, respectively. Theprocess or period in which one image transitions to another forms nopart of the claimed design.

The outer perimeters illustrated by a pair of dashed broken linesrepresent a display screen or a portion thereof and form no part of theclaimed design. The remaining broken lines shown in the drawingsillustrate portions of the transitional graphical user interface thatform no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.